Hydraulic accelerator linkage for automobiles



W. J. BURNWORTH Dec. 27, 1960 HYDRAULIC ACCELERATOR LINKAGE FORAUTOMOBILE Filed April 10. 1959 2 Sheets-Sheet 1 ATTORNEY Dec. 27, 1960w. J. BURNWORTH HYDRAULIC ACCELERATOR LINKAGE FOR AUTOMOBILE Filed April10, 1959 2 Sheets-Sheet 2 ATTORNEY United States Patent QfificeHYDRAULIC ACCELERATOR LINKAGE FOR AUTOMOBILES William J. Bumworth, 6243N. Astor St., Portland 3, Greg.

Filed Apr. 10, 1959, Ser. No. 806,202 11 Claims. ((31. 251-14) Thepresent invention relates to a hydraulic accelerator linkage forautomobiles and the like and is a continuationin-part of my abandonedapplication Serial No. 329,659, filed on January 5, 1953.

An object of the present invention is to provide a device of thischaracter which eliminates the conventional mechanical linkage betweenthe foot accelerator pedal and the throttle valve of the engine.

The mechanical linkage heretofore employed causes driving fatigue sinceonly the foot and toe muscles are used, foot tension or foot nerves andfatigue results. The fluid cushion provided by the present inventionpermits the use of the leg muscles and prevents the foot tension withits resultant fatigue. This fluid cushion also provides for instantsmooth action so that it eliminates the buck-and-jump acceleration whichis caused chiefly by the numerous connections, joints and turns of theconventional mechanical linkage and rods, especially in city traffic.

The conventional mechanical linkage is unreliable and unsafe as with useit becomes loose, catches and sometimes breaks and becomes jammed,leaving the throttle valve of the carburetor in a fully open or partlyopen position. In the present improved device there are relatively fewworking parts so that the chances of becoming loose and catching arereduced to a minimum and in the event of breakage the tendency is to cutoh? the fuel supply rather than jam with the throttle fully open.Another object of the present invention is to provide an improvedhydraulic accelerator control which is fluidtight and small and compactso that it is capable of being installed on any vehicle powered by agasoline engine or other type motor. The installation can be made onvehicles already in service or on vehicles at the time of theirmanufacture.

A further object of the present invention is to provide a device of thischaracter which affords independent adjustment or operation of the idlercontrol for setting the idling position of the throttle Valve, of thehand operated control for the throttle valve and of the foot operatedcontrol for the throttle valve.

In one of its broadest aspects the present invention contemplates theprovision of a hydraulic throttle valve accelerator linkage comprisingfluid actuated means connected to the throttle valve for opening thethrottle valve, and means for closing said throttle valve.

More specifically the present invention aims to provide an improvedhydraulic throttle valve control comprising a member operativelyconnected to the throttle valve, foot operated hydraulic means formoving said member in a direction for opening the throttle valve, handoperated means for moving said member in a direction for opening thethrottle valve, and means for moving said member in the oppositedirection for closing the throttle valve, said foot operated means andsaid hand operated means being so arranged that they can be operatedindependently of and without disturbing one another.

The present invention also aims to provide means for operating thehydraulic throttle valve control which means uses the brake fluid fromthe master brake cylinder of the vehicle to Which the device is applied.

The present invention further aims to provide a device of this kind inwhich an expansible cup is employed and so positioned that it receivesthe compressed fluid and uses the force of the fluid to make the sealtighter between the cup and its cylinder to form an air-tight seal atall times, especially when the pressure of the fluid is increased.

With the foregoing and other objects in view, the invention will behereinafter more fully described and more particularly pointed out inthe appended claims.

In the drawings, in which the same parts are denoted by the samereference numerals throughout the several views,

Figure 1 is a side elevational view of the improved device constructedin accordance with the present invention illustrated as applied to anautomobile and with parts in section,

Figure 2 is a sectional view taken on the line 22 of Figure 1,

Figure 3 is a sectional view taken on the line 33 of Figure 1, A

Figure 3A is a side elevational view of a modified form of expansiblecup,

Figure 3B is a fragmentary sectional view showing the modified form ofcup applied to its cylinder,

Figure 4 is a side elevational view of another form of the inventionshowing the valve in closed position and with parts broken away and withparts in section,

Figure 5 is a fragmentary vertical sectional view of the modified formof the invention showing the valve in open position, 4

Figure 6 is a sectional view taken on the line 66 of Figure 4, and

Figure 7 is an end view of the valve.

Referring more particularly to the drawings, lil indicates theconventional floorboard of an automobile or the like on which ispivotally mounted a conventional foot operated accelerator pedal 11, thepivot which is indicated at 12 being disposed adjacent one end of thepedal 11. The fioorboard has an opening 13 formed therethrough, throughwhich extends the neck 14 of a compression chamber, generally indicatedat 15, which may be in the form of a bellows.

The bellows is positioned between the floorboard and the free endportion of the pedal 11 and its walls 16 may be made of oil resistantrubber or spring brass and possess suflicient resiliency to return totheir normal eX- panded condition when the foot pressure is removed fromthe pedal 11. The bottom 17 of the bellows may be made thicker than thewal s 16 and is substantially flat so as to rest upon the fioorboard.The top 18 of the bellows is thick so as to resist deformation when footpressure is applied thereto through the pedal 11 and the upper surfaceof the top 18 may be dome shaped. The bottom and top may be made of oilresistant rubber or brass or other suitable material.

The neck 14 and bottom 17 are provided with a through passageway 19which communicates with the interior of the compression chamber and witha tube 20, one end portion of which is received by the neck 14 in whichit is frictionally held by a clamping collar 21. The collar 21 encirclesthe neck below the floorboard and squeezes the neck tightly against thetube and also prevents escape of the neck from the fioorboard and thusholds the compression chamber in place.

The opposite end portion of the tube 20 is connected by a swivel joint22 to a nut 23 which is secured to a one of the valve heads of 2,966,328Patented Dec. 27, 1960 cap 24 by welding or the like. The cap 24 isdetachably mounted on one end of a working cylinder 25 by cooperatingscrew threads 26 formed on the interior of the cap and the exterior ofthe cylinder. A flexible cup 27 which may be made of flexible oilresistant rubber or the like is positioned within the end portion of thecylinder 25 adjacent the cap 24 with its closed bottom inwardly of theend of the cylinder and its open top communicating with the interior 28of the cap which provides an oil chamber. The cap 24 has an opening 29therethrough which communicates with the interior of the cap and cup andwith the tube 29. A second opening 30 formed in the cap 24 opens intothe interior 23 of the cap and into an air vent valve 31.

A piston or plunger 32 having two spaced apart heads 33 and 34 isslidably received by the cylinder 25. The head 33 is engaged at alltimes by the bottom of the cup 27 and the head 34 engages at all times apressure plate 35 which may be in the form of a round flat disk and hasa radially extending laterally offset finger 36 extending from theperiphery thereof and which may be formed integrally therewith orattached thereto.

The finger extends outwardly of the cylinder 25 through a slot 37 formedin the bottom of the cylinder and the free end portion of the finger hasa hole therethrough for receiving one end portion of a pin 38 and theopposite end portion of the pin is slidably received by an elongatedslot 39 formed in a link 40. The opposite ends of the pin 38 are upsetso that the pin cannot escape from the hole in the finger and the slotin the link.

The slot 39 terminates short of one end of the link and the unslottedend portion of the link is secured in any suitable manner as by weldingor the like to a member 41 which in turn is fastened by a machine screwor the like to the throttle valve axle or shaft 42 of a carburetor 43.

A cover 44 is detachably mounted on the end of the cylinder 25 oppositeto that on which the cap 24 is mounted by cooperating screw threads 45formed on the cover and the cylinder. The cover 44 has a substantially\centrally disposed screw threaded opening 46 there through foradjustably receiving an exteriorly screw threaded substantiallycup-shaped plug 47. An exteriorly screw threaded boss 48 extends fromthe closed bottom of the plug inwardly of the cylinder 25 and is securedto the outer interiorly screw threaded end portion of a sleeve 49. Inorder to facilitate adjustment of the plug, a non-circular nut-like head50 extends from the closed bottom of the plug outwardly of the cylinderfor receiving a wrench or the like by which the plug may be rotated ineither direction. The inner end of the sleeve 49 is exteriorly screwthreaded as at 51 to receive an interiorly screw threaded abutment 52.

A tube 53 has its outer end portion telescopically received by the innerend portion of the sleeve 49 and has its inner end portion screwthreaded as at 54 to be received by a screw threaded opening 55 in theplate 35. The end of the tube 53 which is disposed within the sleeve 49has secured thereto a centrally apertured disk 56 which has a diameterlarger than that of the tube 53 so that the outer peripheral portion ofthe disk extends beyond the outer face of the tube to form an annularflange 57. The abutment 52 has an inturned annular flange 58 forengaging the flange 57 when the plug 47 is rotated so as to move theplug and the sleeve to the right, looking at Figures 1 and 2 of thedrawings.

A coil spring 59 encircles the. sleeve 49 and the tube 53 and one endengages the inner face of the end wall of the cover 44 and its oppositeend engages a shoulder or land 60 formed on the plate 35.

Hand operated means are provided for opening the throttle valve andcomprises a hand throttle or knob 61 mounted in any suitable manner asby lock nuts 62 on the instrument board 63 of the automobile and a wire64 slidably received by a flexible sheathing 65. The

outer end of the wire 64 is secured to the knob 61 and the inner endportions of the wire 64 and sheathing 65 extend through a passageway 66in the plug 47. At its inner end the sheathing 65 terminates short ofthe inner end of the wire 64 and the exposed inner end portion of thewire extends through the sleeve 49 and the aperture in the disk 56. Theinner end of the wire extends slightly inwardly beyond the disk 56 andhas formed thereon a ball or crimp 67 which is larger than the aperturein the disk.

The cylinder 25 may be attached to the engine or carburetor and for thispurpose the cylinder may be provided with spaced apart flanges dependingfrom the bottom of the cylinder.

In the use of the device, assuming that the bellows 15, the tube 20 andthe cup 27 have been supplied with a suitable fluid, such as oil, whichis used in a conventional hydraulically operated braking system of anautomobile, when the operator of the vehicle depresses the pedal 11, thebellows 15 will be collapsed in proportion to the amount of depressionof the pedal 11. This action will cause the oil to flow through the tube20 and oil chamber 28 and into the cup 27 and increase the oil pressurein the cup 27 causing the cup and the piston 32 (which is to be notedabuts but is unattached to both the cup 27 and pressure plate 35) tomove to the right, looking at Figures 1 and 2 of the drawings. The oilpressure forces the flexible walls of the cup 27 against the inner wallof the cylinder 25 sufiiciently to prevent oil leakage past the cup.

The piston inturn will move the pressure plate 35 to the right andthrough the finger 36 will rotate the link 40 in a clockwise directionthereby turning the throttle valve shaft 42 in a direction to causeopening of the throttle valve. This action will place the coil spring 59under compression so that when the pressure is removed from the pedal11, the spring will move the plate 35 and the piston 32 to the left andreturn the cup 27 to its original position returning oil to the oilchamber 28 and excess oil into the tube 20. The bellows 15 hassuflicient resiliency to return to its normal expanded condition whenthe foot pressure is released from the pedal 11. The parts are then inproper position for the next acceleration operation.

It will be noted that when the plate 35 is moved to the right it willcarry the tube 53 with it, but the tube is freely telescopicallyreceived by the sleeve 49 and the movement of the tube does not disturbthe position of the wire 64 so that the foot accelerator can be usedwithout in any way affecting the hand throttle control. The sleeve 49cooperates with the disk 56 to serve as a guide for the tube 53 andplate 35 during their movements.

When it is desired to use the hand throttle control, the operator willpull the knob 61 which will move the wire 64 to the right, looking atFigures 1 and 2. By means of the ball 67 the movement of the wire 64will cause the tube 53 and plate 35 to move to the right independentlyof and away from piston 32 and open the throttle valve through the crankconnection of finger 36 and link 40 therewith, thus without disturbingthe hydraulic system. When the knob 61 is released the spring 59' willreturn the parts to their original closed positions.

The idling speed of the engine may be regulated by the adjustment of theplug 47. When the plug is rotated so as to move it towards the right, itwill carry the sleeve 49 and the abutment 52 to the right so that theflange 58 of the abutment will be brought into contact with the flange57 on the disk 56. Further movement of the plug 47 will cause the tube53 and plate 35 to be moved to the right to open the throttle valve tothe desired idling position of the engine.

If it is desired to move the throttle valve towards its closed position,rotation of the plug in the opposite direction will permit the spring 59to come into play to move the plate 35 and tube 53 in the oppositedirection. These adjustments can be made without aflecting the hydraulicsystem or the hand throttle control.

Before installing the improved hydraulic accelerator control on vehiclesnow in service, the old mechanical linkage will be removed.

The improved hydraulic accelerator control is designed and installed,with an appropriate mounting, at the carburetor in a position to operatethe carburetor shaft with hydraulic pressure, supplied with a masterbrake cylinder or bellows. The brake cylinder can be installed in aposition where operation with the regular foot accelerator pedal ispossible.

The hydraulic accelerator control can be precision built in everydetail. The internal parts are designed for minimum of strain and thepressure required for operation is not sufficient to cause breakage. Theaccelerator control should last the life of any vehicle on which it maybe installed, with a minimum of cost and servicing. The oil cushiongives instantaneous smooth and steady operation from start to fullcarburetion.

Heavy equipment on construction work, on the highways and city streets,such as trucks, truck-way-cranes, carryalls, city buses with motors inthe rear and airplanes require complete and safe engine control at alltimes which cannot be had with mechanical linkage, rods and wires. Ourcity streets and highways carry heavy traflic of all types of motorizedequipment and the present improved hydraulic acceleration control cansupply to these vehicles the safe engine control that hydraulic brakeshave supplied to vehicle control.

In Figures 3A and 3B of the drawings is illustrated a modified form ofcup which may be substituted for the cup 27 shown in Figure 1. Thismodified form of cup is generally indicated at 27a and comprises aclosed base 27b and an outwardly flared open ended body 270. As isillustrated in Figure 3B, the cup 27:: may be located in the cylinder25a in the same manner and position as the cup 27 is mounted in thecylinder 25 in Figure l and the parts of Figure 3B corresponding tothose of Figure 1 have applied thereto the same reference character withthe suflix a added thereto.

The base 27b of the cup 27a has an outside diameter equal to the insidediameter of the cylinder 25a so that the outer face of the base 27b willgrip the inner face of the cylinder wall to set up an air-tight andfluid-tight seal therebetween. The outer diameter of the flared body 27cwill be greater than the inside diameter of the cylinder and the cup ismade of resilientmaterial, such as rubber, so that when the cup islocated in the cylinder, the body 270 will be deformed from the fullline position of Figure 3A to the dotted line position of Figure 3A. Theouter face of the body 270 will tightly grip the inner face of thecylinder wall as shown in Figure 3B to augment the air-tight andfluid-tight seal between the cup 27a and the wall of the cylinder 25a.The mold of the cup and the flared body will cause the cup to cling tothe cylinder wall at all times. Merely byway of example, the outsidediameter of the cup base 276 and the inside diameter of the cylinder maybe and the outside diameter of the flared body 270 may be 1176.6.

The inner face of the body 270 of the cup is tapered outwardly from thebase 27b towards the open end of the cup and body terminates in a sharpthin edge 27d. It will be noted from Figure 3B that the wall of the body27c is of gradually decreasing thickness from the base 27b towards theedge 27d so that the edge and the adjacent wall portion will be easilyflexed outwardly by the pressure of the fluid within the cup to ensurethe tight seal.

Referring to the form of the invention illustrated in Figures 4 through7 of the drawings, there is shown a structure which may be used in placeof the bellows of Figure l, in which 68 represents the reserve oilchamber of the master brake cylinder of a vehicle. A cover 69 isremovably secured to the open top of the chamber by cap screws 70 and 71The cover 69 may be provided with the usual screw threaded fillingopening which may be closed by a removable closure plug 72 A mountingplate 73 is secured to the cover 69 by the cap screws 71 and extendsbeyond the cover and chamber. The extended portion of the plate 73 has adepending flan A substantially T-shaped lever or arm generally indicatedat 75 is pivotally connected as at 76 adjacent one end of its head 77 tothe plate 74 adjacent the free end thereof. The head 77 is pivotallyconnected adjacent its opposite end as at 78 to a rod 79 adjacent theone end thereof. The rod 79 may extend through the floor board 10 of thevehicle and is connected to the foot accelerator pedal 11 in aconventional manner.

The lever 75 has a leg 80, the free end portion of which is received bya recess 82 formed in a block 81. The recess 82. opens through the rearface and the lower face of the block to receive the free end portion ofthe leg 80 to permit the necessary movement of the lever 75. The recess82 however is of suflicient depth and height to prevent the accidentalescape of the leg 80 therefrom. The block 81 forms a part of a plungerattachment generally indicated at 83 which also comprises a rod 84 and acone-shaped member or pusher 85. The block 81 is mounted on the rear endof the rod 84 and the pusher 85 is mounted on the forward end of the rod84. The rod 84 has a bearing 86 which comprises a nut-like head 87 and abearing or guide sleeve 88.

The sleeve 88 is exteriorly screw threaded and is received by a screwthreaded bore 89 formed through a closure plug 90 which closes the rearopen end of an oil pressure cylinder 91. The plug 90 is exteriorly screwthreaded and is removably received by the interiorly screw threaded openend portion of the cylinder 91. Aliquidtight sealing washer 92 iscarried by the cylinder 91 forwardly of the plug 90 and is received byan annular groove 93 formed in the inner wall of the cylinder 91 at theinner end of the screw threads of the cylinder.

The cone-shaped member 85 extends forwardly into the cylinder 91 and isreceived by a similarly shaped socket 94 formed in the rear end portionof a plunger or piston 95 which has two spaced apart heads 96 and 97.The heads 96 and 97 are of slightly less diameter than the insidediameter of the cylinder 91. The head 96 has an intermediate peripheralgroove 98 formed therein, in which is secured by a suitable adhesive thestem of a T-shaped sealing gasket 99, the top of which overlies theouter face of the head 96 and extends inwardly therebeyond. The gasketis disposed in the space between the head 96 and the inner wall of thecylinder and snugly engages the inner cylinder wall. A rubber oil sealwhich may be in the form of a disk 100 is secured to the inner face ofthe head 97 and has a diameter substantially equal to the insidediameter of the cylinder 91 so that the periphery of the disk snuglyengages the inner wall of the cylinder.

An end plate 101 is secured in an appropriate manner to the endconvolution at the large end of a tapered spiral spring 102 and abutsthe plate 101. The end convolution of the small end of the spring isreceived by a cupshaped member 103 which forms part of a valve devicegenerally indicated at 104. The cup member 103 has a plurality ofinwardly extending tangs 105 which overlie and engage the endconvolution of the small end of the spring to retain it within the cupmember 103. The bottom of the cup member 103 has an opening 106therethrough and is secured by a suitable adhesive to a re,- silientwasher 107 which may be made of rubber or other appropriate material.The washer is in turn secured in any suitable manner to one face of arigid ring 108 which may be m d r m ra o o he pro ia material. A secondwasher 109 is secured in any suitable manner to the opposite face of thering 108.

The valve 104 also comprises a valve stem 110 having a valve head 111 onone end thereof and having its opposite end portion of reduced diameteras indicated at 112 on which is mounted a head 113. The heads 111 and113 may be secured to the valve stem 110 in any suitable manner. Thevalve stem extends through and is spaced from the walls of the openingsin the member 103, the washers 107 and 109 and the ring 108 so that anannular passageway 114 is provided therebetween. An annular recess 115is formed in the washer 109 which provides a valve seat for the valvehead 111 and the bottom of the cup member 103 provides a valve seat 116for the valve head 113. The bottom of the valve head 113 has a pluralityof openings 117 and an annular flange 118 extends rearwardly from thebottom of the valve head 113.

The ring 108 has a plurality of angularly spaced fingers 119 extendinginwardly therefrom towards the valve stem 110 with the inner free edgesof the fingers engaging and supporting the valve stem. The inner edgesof the fingers may be arcuate to conform to the round shape of the valvestem. The forward end portion of the wall of the cylinder 91 asindicated at 120 is thicker than the remainder of the cylinder wall sothat an inner rearwardly facing annular shoulder 121 is formed withinthe cylinder 91. The washer 109 may be made of rubber and has a diametersubstantially equal to the inside diameter of the thickened wall portionof the cylinder 91 so that the washer 109 forms a liquid tight seal withthe inner face of the cylinder wall at a point just forward of theshoulder 121. The outer periphery of the ring 108 has a plurality ofangularly spaced substantially L-shaped lugs 122 extending therefrom.The short legs of the lugs extend radially from the ring 108 and areheld against the shoulder 121 by the spring 102 and the long legs extendaxially thereof and engage the inner wall of the cylinder to prevent thevalve 104 from becoming canted within the cylinder.

The bottom of the chamber 68 and the top of the cylinder 91 has athrough aperture 123 so that the brake fluid may pass from the chamber68 to the cylinder 91 to supply the fluid necessary for the operation ofthe piston 32 of Figure 1. The forward end wall of the cylinder 91 has ascrew threaded opening 124 for receiving the screw threaded end of areducer 125 which forms a part of a screw on connection 126 mounted onthe free end of the tube 20. Apertured mounting flanges 127 may beprovided for mounting the device on the vehicle at any appropriatelocation.

In the operation of the form of the invention illustrated in Figures 4through 7 of the drawings, assuming that the engine is idling, the valve104 will be in the position shown in Figure 4 of the drawings and thespring 102 will have moved the plunger 95 to the right looking at Figure4 until the rear end of the pusher 85 abuts the plug 90. At this timethe valve head 111 will be seated on its seat 115 and the valve 104 willbe in its closed position to prevent the oil from escaping from the tube20 into the cylinder 91.

If the operator of the vehicle depresses the foot accelelator pedal 11,the arm 75 will be swung forwardly on its pivot 76 and the pusher 85will move the plunger 95 to the left looking at Figure 4 of thedrawings. This will place the fluid in the cylinder 91 under pressureand the oil under pressure will act upon the valve heads 111 and 113 tounseat the valve head 111 from its seat 115 and move the head 113against its seat 116 to open the valve as shown in Figure of thedrawings. The oil will flow through the openings 117 in the head 113,through the passageway 114 into the tube 20 and actuate the piston 32 inthe manner described in connection with the form of the invention shownin Figures l-3.

Further depression of the foot accelerator pedal will volume of oil tooperate cylinder 25,

place the fluid under higher pressure and force more oil through thevalve in the above mentioned manner until the pressure plate 35 has beenmoved to the right to its maximum position which will open thecarburetor throttle to its fully open position.

When the pressure is removed from the pedal 11, the spring 102 will movethe plunger to the right looking at Figure 4 until the pusher 85 engagesthe plug 90. At this time the oil in the tube 20 will attempt to flowback into the cylinder 91, but the flow of oil against the valve head111 will push the head 111 against its valve seat thereby stopping theflow of oil into the cylinder 91 and trapping the oil in the tube 20 andthe chamber 28.

Enough oil can escape past the valve in the process of closing to allowfor efiicient operation of cylinder 25. As acceleration is increasedmore oil must enter line 20 and cylinder 25, as acceleration isdecreased the oil must escape from cylinder 25. Since it takes only asmall this excess can flow back into cylinder 91 while the valve is inthe process of closing.

Trapping the oil in line 20 and chamber 28 is essential. When onlyslight pressure is applied on the accelerator pedal 11, cylinder 91 willincrease the volume of oil in line 20 and chamber 28 to instantly startcup 27 in motion. This is why the valve must be very sensitive to theflow of oil in either direction.

While driving, acceleration is increased and decreased constantly;during this operation the valve heads on the valve stem are travelingwith the flow of oil in either direction, always opening to allow moreoil to enter line 20 when required and closing in time to keep line 20and chamber 28 full of oil at all times.

It is obvious that various changes and modifications may be made in thedetails of construction and design of the above specifically describedembodiment of this invention without departing from the spirit thereof,such changes and modifications being restricted only by the scope of thefollowing claims.

What I claim is:

1. A throttle valve and hydraulic control therefor comprising a memberadapted to be operatively connected to the throttle valve, foot operatedhydraulic means for moving said member in a direction for opening thethrottle valve, hand operated means for moving said member in adirection for opening the throttle valve, and means for moving saidmember in the opposite direction for closing the throttle valve, saidhand operated means comprising an element attached to said member formovement therewith independently of and away from said foot operatedhydraulic means for opening the throttle valve, a manually operateddevice and lost-motion connection means be tween said element and saiddevice for moving the element and said member in said throttle valveopening direction when said device is moved in one direction andpermitting said element and said member to move in said throttle valveopening direction under the influence of said foot operated hydraulicmeans so that said foot operated means and said hand operated means canbe operated independently of and without disturbing one another, theelement of said hand operated means comprising a tube having one endsecured to said member, a sleeve telescopically receiving the other endof said tube, a portion of said hand operated means being freelyreceived by said tube and sleeve, and said lost-motion connection meanscomprising cooperating parts on said portion and on said tube forinterengaging when said hand operated means is actuated to move saidtube and member in their throttle valve opening direction but permittingsaid :hand operated means to be undisturbed when said foot operatedmeans is actuated.

2. A throttle valve and hydraulic control therefor as claimed in claim1, characterized by the fact that means are provided for adjusting theidling position of the throttle valve without disturbing said footoperated means and said hand operated means and comprising a plugrotatably mounted for axial movement in both directions and secured tosaid sleeve for moving said sleeve therewith.

3. A hydraulic control comprising a member, foot operated hydraulicmeans for moving said member in one direction, hand operated means formoving said member in said one direction comprising an element attachedto said member for movement therewith independently of and away fromsaid foot operated hydraulic means for opening the throttle valve, amanually operated device and lost-motion connection means between saidelement and said device for moving the element and said member in saidone direction when said device is moved in one direction and permittingsaid element and member to move in said first one direction under theinfluence of said foot operated hydraulic means so that said footoperated means and said hand operated means can be operatedindependently of and without disturbing one another, the element of saidhand operated means comprising a tube having one end secured to saidmember, a sleeve telescopically receiving the other end of said tube, aportion of said hand operated means being freely received by said tubeand sleeve, and said lost-motion connection means comprising cooperatingparts on said portion and on said tube for interengaging when said handoperated means is actuated to move said tube and member in said firstone direction but permitting said hand operated means to be undisturbedwhen said foot operated means is actuated, and means for moving saidmemher in the opposite direction.

4- A hydraulic control as claimed in claim 3 wherein said foot operatedhydraulic means comprises an oil pressure cylinder, a plunger working insaid oil pressure cylinder for causing the oil to actuate said member, apusher engaging said plunger, an arm operatively connected to saidpusher, a valve device mounted in said oil pressure cylinder forcontrolling the flow of the oil, and a spring interposed between theplunger and the valve device for mounting the valve device in its oilflow controlling position and for returning the plunger to itsnonworking position after being actuated by the pusher.

5. A hydraulic control as claimed in claim 3 further comprising acylinder having a fluid chamber therein, said member being positionedwithin the cylinder, a piston working in the cylinder and operativelyconnected to said member, a flexible cup mounted within the cylinderbetween said chamber and piston to receive fluid from said chamber andoperatively connected to said piston, said foot operated hydraulic meansadapted to force fluid into said cup for expanding said cup to seal itagainst the inner wall of the cylinder and to move said piston andmember in said first one direction and comprising a bellows, a pedal forcollapsing said bellows, and a tube connecting said bellows to saidchamber, said means for mow'ng said member and piston in the oppositedirection being a resilient means.

6. A hydraulic control as claimed in claim 5 wherein said cup isexpansible and has one end open for receiving the fluid, the over-alloutside diameter of the cup being such that the outer face of its wallengages the inner face of the wall of the cylinder at all times toprevent leakage of the fluid into the cylinder when the member andpiston have been moved in said opposite direction and to be expanded bythe fluid under pressure into tighter engagement with the inner face ofthe wall of the cylinder to prevent leakage of the compressed fluid intothe cylinder when the member and piston have been moved in said firstone direction.

7. A hydraulic control as claimed in claim 6 wherein the fluid entersthe cylinder through a cap on one end of the cylinder, and the edge ofthe cup Wall defining the cup opening freely engages the inner surfaceof the cap.

8. A hydraulic control as claimed in claim 3 wherein said -foot operatedhydraulic means comprises a cylinder receiving said member, a pistonworking in the cylinder and operatively connected to the member, anexpansible cup operatively connected to said piston, an oil pressurecylinder having communication with said first cylinder, a plungerworking in said oil pressure cylinder, a valve device for interruptingthe communication between said cylinders, and resilient means betweensaid valve device and plunger for moving said plunger to its non-workingposition and for mounting the valve device adjacent the point ofcommunication between said cylinders.

9. A hydraulic control as claimed in claim 8 characterized by the factthat said valve device comprises relatively movable parts one of whichis adapted to be moved to its open position during the working stroke ofthe plunger and to its closed position during the non-working stroke ofthe plunger.

10. A throttle valve and hydraulic control therefor as claimed in claim1 wherein said foot operated hydraulic means comprises a cylinder, apiston working in the cylinder and operatively connected to said member,and an expansible cup operatively connected to said piston and havingone end open, said cup having a base with an outside diameter equal tothe inside diameter of the cylinder and a flared sidewall portionconfined within the cylinder wall, tending when unstressed to have anoutside diameter greater than the inside diameter of the cylinder.

11. A throttle valve and hydraulic control therefor as claimed in claim10 wherein the sidewall portion has a wall which progressivelydiminishes in thickness from the base to the open end of the cup andterminates in a thin edge adjacent the open end of the cup.

No references cited.

